feat(example app): qr code parser

parser to read iden3message from qrCode, currently the iden3message can be in three formats, encoded base64, raw json and url from where to retrieve the json
0xPolygonID · Nov 27, 2023 · 15750e3 · 15750e3
1 parent a076457
commit 15750e3
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Showing 4 changed files with 83 additions and 7 deletions.
diff --git a/example/lib/src/presentation/dependency_injection/dependencies_provider.dart b/example/lib/src/presentation/dependency_injection/dependencies_provider.dart
@@ -17,6 +17,7 @@ import 'package:polygonid_flutter_sdk_example/src/presentation/ui/home/home_bloc
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/restore_identity/bloc/restore_identity_bloc.dart';
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/sign/sign_bloc.dart';
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/splash/splash_bloc.dart';
+import 'package:polygonid_flutter_sdk_example/utils/qr_code_parser_utils.dart';
 
 final getIt = GetIt.instance;
 
@@ -34,6 +35,7 @@ Future<void> init() async {
   registerIdentityDependencies();
   registerBackupIdentityDependencies();
   registerRestoreIdentityDependencies();
+  registerUtilities();
 }
 
 void registerEnv() {
@@ -83,7 +85,11 @@ void registerHomeDependencies() {
 
 ///
 void registerClaimsDependencies() {
-  getIt.registerFactory(() => ClaimsBloc(getIt(), getIt()));
+  getIt.registerFactory(() => ClaimsBloc(
+        getIt(),
+        getIt(),
+        getIt(),
+      ));
 }
 
 ///
@@ -93,7 +99,7 @@ void registerClaimDetailDependencies() {
 
 ///
 void registerAuthDependencies() {
-  getIt.registerFactory(() => AuthBloc(getIt()));
+  getIt.registerFactory(() => AuthBloc(getIt(), getIt()));
 }
 
 ///
@@ -125,3 +131,9 @@ void registerRestoreIdentityDependencies() {
   getIt
       .registerFactory<RestoreIdentityBloc>(() => RestoreIdentityBloc(getIt()));
 }
+
+/// Register utilities
+void registerUtilities() {
+  getIt.registerLazySingleton<QrcodeParserUtils>(
+      () => QrcodeParserUtils(getIt()));
+}
diff --git a/example/lib/src/presentation/ui/auth/auth_bloc.dart b/example/lib/src/presentation/ui/auth/auth_bloc.dart
@@ -13,15 +13,20 @@ import 'package:polygonid_flutter_sdk_example/src/presentation/ui/auth/auth_even
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/auth/auth_state.dart';
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/common/widgets/profile_radio_button.dart';
 import 'package:polygonid_flutter_sdk_example/utils/nonce_utils.dart';
+import 'package:polygonid_flutter_sdk_example/utils/qr_code_parser_utils.dart';
 import 'package:polygonid_flutter_sdk_example/utils/secure_storage_keys.dart';
 
 class AuthBloc extends Bloc<AuthEvent, AuthState> {
   final PolygonIdSdk _polygonIdSdk;
+  final QrcodeParserUtils _qrcodeParserUtils;
 
   static const SelectedProfile _defaultProfile = SelectedProfile.public;
   SelectedProfile selectedProfile = _defaultProfile;
 
-  AuthBloc(this._polygonIdSdk) : super(const AuthState.initial()) {
+  AuthBloc(
+    this._polygonIdSdk,
+    this._qrcodeParserUtils,
+  ) : super(const AuthState.initial()) {
     on<ClickScanQrCodeEvent>(_handleClickScanQrCode);
     on<ScanQrCodeResponse>(_handleScanQrCodeResponse);
     on<ProfileSelectedEvent>(_handleProfileSelected);
@@ -53,8 +58,8 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
     }
 
     try {
-      final Iden3MessageEntity iden3message = await _polygonIdSdk.iden3comm
-          .getIden3Message(message: qrCodeResponse);
+      final Iden3MessageEntity iden3message = await _qrcodeParserUtils
+          .getIden3MessageFromQrCode(qrCodeResponse);
       emit(AuthState.loaded(iden3message));
 
       String? privateKey =

diff --git a/example/lib/src/presentation/ui/claims/claims_bloc.dart b/example/lib/src/presentation/ui/claims/claims_bloc.dart
@@ -17,15 +17,18 @@ import 'package:polygonid_flutter_sdk_example/src/presentation/ui/claims/mappers
 import 'package:polygonid_flutter_sdk_example/src/presentation/ui/claims/models/claim_model.dart';
 import 'package:polygonid_flutter_sdk_example/utils/custom_strings.dart';
 import 'package:polygonid_flutter_sdk_example/utils/nonce_utils.dart';
+import 'package:polygonid_flutter_sdk_example/utils/qr_code_parser_utils.dart';
 import 'package:polygonid_flutter_sdk_example/utils/secure_storage_keys.dart';
 
 class ClaimsBloc extends Bloc<ClaimsEvent, ClaimsState> {
   final ClaimModelMapper _mapper;
   final PolygonIdSdk _polygonIdSdk;
+  final QrcodeParserUtils _qrcodeParserUtils;
 
   ClaimsBloc(
     this._mapper,
     this._polygonIdSdk,
+    this._qrcodeParserUtils,
   ) : super(const ClaimsState.initial()) {
     on<FetchAndSaveClaimsEvent>(_fetchAndSaveClaims);
     on<GetClaimsEvent>(_getClaims);
@@ -322,8 +325,8 @@ class ClaimsBloc extends Bloc<ClaimsEvent, ClaimsState> {
     }
 
     try {
-      final Iden3MessageEntity iden3message = await _polygonIdSdk.iden3comm
-          .getIden3Message(message: qrCodeResponse!);
+      final Iden3MessageEntity iden3message = await _qrcodeParserUtils
+          .getIden3MessageFromQrCode(qrCodeResponse!);
       emit(ClaimsState.qrCodeScanned(iden3message));
     } catch (error) {
       emit(const ClaimsState.error("Scanned code is not valid"));

diff --git a/example/lib/utils/qr_code_parser_utils.dart b/example/lib/utils/qr_code_parser_utils.dart
@@ -0,0 +1,56 @@
+import 'dart:convert';
+
+import 'package:http/http.dart';
+import 'package:polygonid_flutter_sdk/iden3comm/domain/entities/common/iden3_message_entity.dart';
+import 'package:polygonid_flutter_sdk/sdk/polygon_id_sdk.dart';
+
+class QrcodeParserUtils {
+  final PolygonIdSdk _polygonIdSdk;
+
+  QrcodeParserUtils(this._polygonIdSdk);
+
+  ///
+  Future<Iden3MessageEntity> getIden3MessageFromQrCode(String message) async {
+    try {
+      String rawMessage = message;
+      if (message.startsWith("iden3comm://?i_m")) {
+        rawMessage = await _getMessageFromBase64(message);
+      }
+
+      if (message.startsWith("iden3comm://?request_uri")) {
+        rawMessage = await _getMessageFromRemote(message);
+      }
+
+      Iden3MessageEntity? _iden3Message =
+          await _polygonIdSdk.iden3comm.getIden3Message(message: rawMessage);
+      return _iden3Message;
+    } catch (error) {
+      throw Exception("Error while processing the QR code");
+    }
+  }
+
+  ///
+  Future<String> _getMessageFromRemote(String message) async {
+    try {
+      message = message.replaceAll("iden3comm://?request_uri=", "");
+      Response response = await get(Uri.parse(message));
+      if (response.statusCode != 200) {
+        throw Exception("Error while getting the message from the remote");
+      }
+      return response.body;
+    } catch (error) {
+      throw Exception("Error while getting the message from the remote");
+    }
+  }
+
+  ///
+  Future<String> _getMessageFromBase64(String message) async {
+    try {
+      message = message.replaceAll("iden3comm://?i_m=", "");
+      String decodedMessage = String.fromCharCodes(base64.decode(message));
+      return decodedMessage;
+    } catch (error) {
+      throw Exception("Error while getting the message from the base64");
+    }
+  }
+}